Following the original buck, all my panels came out the correct shape.
Only one problem with that. The buck was made wrong.
The first pic shows that the bottom of the hood would have a downwards curve, then go up and then down again.
This is unacceptable so some major surgery is called for.
I made another buck on top of the mess in order to make a flexible shaped pattern.
Third pic shows more waviness from a different angle.